Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1e7cbe4094a1ac…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 09:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2bf1f018ceeb4bdb6e6067c0050614bb SHA-1: b74df94eaaa1d4f67b47cb285b478ca99ec7bdc0 SHA-256: 4f1e7cbe4094a1acfa679a49dacb43d0c499ee6ac32746da37625f7594a23cc3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is detected as malicious by ClamAV and an ML classifier, and heuristics indicate it's a link farm pointing to compromised WordPress uploads and potentially a remote support tool lure. The embedded URLs likely lead to the download of a second-stage payload, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=wolf+brother+pdf PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6faf87oa5m44s92rrf59nf7m81/14237253049.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3v1fn3vceqksfhs41k80gsek74/24025542892.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/22750684834.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/14a6cf54b70fa6145506a4a027b6bd88/59552750181.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/56684052741.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/54106368496.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/25300427757.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0107d4bf---20163809210.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/83419406036.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2ce720f21f5f6e5ec0b4bad121c58446/83375302936.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/37176553025.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/mejugeluvimofozagemabedo.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/69091995780.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/cau36eiti84p1krb6ktkj4d7gm/bovovabipujitaxe.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/varepaxezogaruzop.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/da83d640c83d8dd7d90d01b0372a2416/52775759453.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3740605a6b12a275a0f4ff6eca3ba854/zobinid.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa7d9191d---mulikogozigifuriraziw.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/7030600230.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee31b3e916---71740625045.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78b046e04---zakozukiva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 10200 bytes
SHA-256: 7623cefa51d27e9467345ff6168ef2526989dea2102555854a30672ff0cea167
font_01_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 18400 bytes
SHA-256: 69f3e64230530f1176f00237842533ddb778735582283109f4a60c593eddf8a3
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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